converting pixel aspect format

hello,

I started rendering a 3d presentation at 720x480 with a pixel aspect format of .9 but my dear client has just told me that they are going to show it on a plasma and that he really wants to take advantage of it. This presentation is due monday and I reall y don't have time to re-renderer the animation. Is there a way for me to change the aspect ratio to 1.2 and not lose the quality of the image?

If you change the pixel aspect ratio, the image won't lose quality per se, but it will look "odd". Additionally you'll have to re-encode the video to change the pixel ratio, so I'd just re-render the whole thing if I were you